batgrbproduct Analysis for Trigger=115135
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Sat Jan 5 00:51:43 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger115135/SDC
======================================================================
Trigger: 00115135 Segment: 000
BAT Trigger Time: 135749511.104 [s; MET]
Trigger Stop: 135749516.608 [s; MET]
UTC: 2005-04-21T04:11:51.617220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 307.241049309564 Dec: 73.6651583611281 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6
Image Trigger?: NO
Rate S/N Ratio: 9.8488578017961 [ if not an image trigger ]
Image S/N Ratio: 6
Flight Position: [ source = BAT ]
RA: 307.241049309564 Dec: 73.6651583611281 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 307.381699982485 Dec: 73.6777505394526 [deg; J2000]
{ 20h 29m 31.6s , +73d 40' 39.9" }
+/- 2.89843791129835 [arcmin] (estimated 90% radius based on SNR)
+/- 1.2940931335496 [arcmin] (formal 1-sigma fit error)
SNR: 6.65095626439395
RA = 20h 29m 31.6s (307.381700 deg.)
Dec = 73d 40' 40" (73.677751 deg.)
Angular difference between Flight and Ground position is 2.489984 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 8.41200000047684 +/- 3.45037504459753
Measured from: 0.196000009775162
to: 8.608000010252 [s; relative to TRIGTIME]
T50: 2.56800001859665 +/- 3.48308197144675
Measured from: 0.947999984025955
to: 3.5160000026226 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.403999984264374
to: 1.40399998426437 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0439999997615814
to: 8.74000000953674 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.042256 0.059828 0.040627 0.011346
0.013255 0.013746 0.012063 0.010288 [error]
Peak 0.015829 0.015937 0.015696 0.002942
0.004610 0.004815 0.004240 0.003556 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.49e-08 2.50e-08 3.19e-08 8.18e-08 9.45e-08 1.54e-07 erg/cm2
Error 5.63e-09 6.23e-09 1.15e-08 6.17e-08 2.74e-08 7.23e-08 erg/cm2
Peak flux Power-law 1.52e-01 1.45e-01 9.71e-02 1.01e-01 4.35e-01 4.96e-01 ph/cm2/s
Error 6.42e-02 3.92e-02 3.46e-02 7.37e-02 1.14e-01 1.32e-01 ph/cm2/s
Fluence Cutoff-PL 1.32e-08 2.81e-08 3.28e-08 2.21e-08 8.78e-08 9.68e-08 erg/cm2
Error 6.75e-09 8.99e-09 1.38e-08 7.24e-08 2.96e-08 8.19e-08 erg/cm2
Peak flux Cutoff-PL 1.52e-01 1.47e-01 9.76e-02 9.21e-02 4.35e-01 4.87e-01 ph/cm2/s
Error 6.41e-02 4.59e-02 3.77e-02 9.47e-02 1.13e-01 1.49e-01 ph/cm2/s
Fluence Band 1.31e-08 2.80e-08 3.27e-08 2.22e-08 8.78e-08 9.55e-08 erg/cm2
Error 6.66e-09 8.90e-09 1.37e-08 7.23e-08 2.96e-08 7.52e-08 erg/cm2
Peak flux Band 1.46e-01 1.49e-01 9.86e-02 9.14e-02 4.34e-01 4.78e-01 ph/cm2/s
Error 7.08e-02 4.22e-02 3.72e-02 6.68e-02 1.14e-01 2.02e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.649 0.440 - - 1.17e-03 3.18e-04 36.888 57
CPL 0.673 2.261 63.0 5000.0 3.92e-03 7.63e-02 36.212 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.583 0.472 - - 3.41e-03 9.54e-04 62.246 57
CPL 1.385 1.579 152.5 5000.0 4.30e-03 2.22e-02 62.250 0
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.696 0.044 8.740
T90 8.412 0.196 8.608
T50 2.568 0.948 3.516
Peak 1.000 0.404 1.404
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
307.3817 +73.6778 0.0291 25.3 3.9 0.1580 6.7 TRIG_00115135
------------------------------------------
Foreground time interval of the image:
0.044 8.740 (delta_t = 8.696 [sec])
Background time interval of the image:
-247.099 0.044 (delta_t = 247.143 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.044 sec. to 8.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64877 ( -0.424454 0.455767 )
Norm@50keV : 1.168606E-03 ( -3.242294E-04 3.127481E-04) )
------------------------------------------------------------
Chi-Squared = 36.88845 using 59 PHA bins.
Reduced chi-squared = 0.6471657 for 57 degrees of freedom
Null hypothesis probability = 0.982
Photon flux (15-150 keV) in 8.696 sec: 0.152523 ( -0.037898 0.037933 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.45377e-08 ( -2.70093e-08 2.78898e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.044 sec. to 8.740 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.672962 ( -2.99466 1.52813 )
Epeak [keV] : 62.9511 ( -62.9411 9937.05 )
Norm@50keV : 3.918948E-03 ( -3.918949E-03 0.148615 )
------------------------------------------------------------
Chi-Squared = 36.21175 using 59 PHA bins.
but latest trial 2.20109 gives Chi-Squared = 12.6256
Reduced chi-squared = 0.6466383 for 56 degrees of freedom
Null hypothesis probability = 0.981
Photon flux (15-150 keV) in 8.696 sec: 0.147825 ( -0.039637 0.039261 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.78279e-08 ( -2.82463e-08 3.09882e-08 ) ergs/cm2
Band function
Time interval is from 0.044 sec. to 8.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.990885 ( -9.00912 5.99088 )
beta : -2.33814 ( -7.66186 10.0340 )
Epeak [keV] : 74.9245 ( -74.8245 9925.08 )
Norm@50keV : 2.566823E-03 ( -2.566823E-03 4.198292E-02) )
------------------------------------------------------------
Chi-Squared = 36.27911 using 59 PHA bins.
Reduced chi-squared = 0.6596201 for 55 degrees of freedom
Null hypothesis probability = 0.976
Photon flux (15-150 keV) in 8.696 sec: 0.148393 ( -0.039142 0.038557 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.77774e-08 ( -2.81012e-08 3.10273e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.404 sec. to 1.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58261 ( -0.459204 0.485656 )
Norm@50keV : 3.406874E-03 ( -9.719250E-04 9.358416E-04) )
------------------------------------------------------------
Chi-Squared = 62.24583 using 59 PHA bins.
Reduced chi-squared = 1.092032 for 57 degrees of freedom
Null hypothesis probability = 0.295
Photon flux (15-150 keV) in 1.000 sec: 0.435474 ( -0.114265 0.114402 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1965e-08 ( -9.5813e-09 9.7568e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.404 sec. to 1.404 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38506 ( -1.97049 1.18822 )
Epeak [keV] : 152.459 ( -152.449 9847.54 )
Norm@50keV : 4.297512E-03 ( -4.297512E-03 4.014889E-02) )
------------------------------------------------------------
Chi-Squared = 62.25048 using 59 PHA bins.
but latest trial 2.57294 gives Chi-Squared = 1.22998
Reduced chi-squared = 1.111616 for 56 degrees of freedom
Null hypothesis probability = 0.264
Photon flux (15-150 keV) in 1.000 sec: 0.434755 ( -0.113537 0.11332 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14857e-08 ( -9.6925e-09 1.02392e-08 ) ergs/cm2
Band function
Time interval is from 0.404 sec. to 1.404 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10699 ( -8.89301 6.10699 )
beta : -2.28672 ( -8.35218 11.3660 )
Epeak [keV] : 93.9561 ( -61.4371 9938.46 )
Norm@50keV : 5.897439E-03 ( -6.954658E-03 112.203 )
------------------------------------------------------------
Chi-Squared = 62.36347 using 59 PHA bins.
Reduced chi-squared = 1.133881 for 55 degrees of freedom
Null hypothesis probability = 0.231
Photon flux (15-150 keV) in 1.000 sec: 0.433975 ( -0.114068 0.113732 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14953e-08 ( -8.8341e-09 1.0183e-08 ) ergs/cm2
Plot creation:
Sat Jan 5 01:03:59 EST 2008